From: John Tsiombikas <nuclear@member.fsf.org>
Date: Thu, 10 Dec 2020 07:54:23 +0000 (+0200)
Subject: first half-assed attempt at old wahsed-out post effect failed
X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=demo_prior;a=commitdiff_plain;h=5eefe7b94c8d6c6caa2c10e3835ab0831a3c42a1

first half-assed attempt at old wahsed-out post effect failed
---

diff --git a/sdr/gamma.v.glsl b/sdr/gamma.v.glsl
deleted file mode 100644
index 4c3c8ef..0000000
--- a/sdr/gamma.v.glsl
+++ /dev/null
@@ -1,5 +0,0 @@
-void main()
-{
-	gl_Position = gl_Vertex;
-	gl_TexCoord[0] = gl_MultiTexCoord0 * vec4(1.0, -1.0, 1.0, 1.0);
-}
diff --git a/sdr/oldfig.p.glsl b/sdr/oldfig.p.glsl
new file mode 100644
index 0000000..a51e52c
--- /dev/null
+++ b/sdr/oldfig.p.glsl
@@ -0,0 +1,30 @@
+uniform sampler2D tex;
+
+vec3 rgb2hsv(in vec3 rgb);
+vec3 hsv2rgb(in vec3 hsv);
+
+void main()
+{
+	vec3 texel = texture2D(tex, gl_TexCoord[0].st).rgb;
+	vec3 hsv = rgb2hsv(texel);
+	vec3 rgb = hsv2rgb(hsv * vec3(0.97, 0.8, 0.9));
+
+	gl_FragColor = vec4(rgb, 1.0);
+}
+
+
+vec3 rgb2hsv(in vec3 rgb)
+{
+    vec4 k = vec4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0);
+    vec4 p = mix(vec4(rgb.bg, k.wz), vec4(rgb.gb, k.xy), step(rgb.b, rgb.g));
+    vec4 q = mix(vec4(p.xyw, rgb.r), vec4(rgb.r, p.yzx), step(p.x, rgb.r));
+    float d = q.x - min(q.w, q.y);
+    float e = 1.0e-10;
+    return vec3(abs(q.z + (q.w - q.y) / (6.0 * d + e)), d / (q.x + e), q.x);
+}
+
+vec3 hsv2rgb(in vec3 hsv)
+{
+    vec3 rgb = clamp(abs(mod(hsv.x * 6.0 + vec3(0.0, 4.0, 2.0), 6.0) - 3.0) - 1.0, 0.0, 1.0 );
+	return hsv.z * mix(vec3(1.0), rgb, hsv.y);
+}
diff --git a/sdr/post.v.glsl b/sdr/post.v.glsl
new file mode 100644
index 0000000..4c3c8ef
--- /dev/null
+++ b/sdr/post.v.glsl
@@ -0,0 +1,5 @@
+void main()
+{
+	gl_Position = gl_Vertex;
+	gl_TexCoord[0] = gl_MultiTexCoord0 * vec4(1.0, -1.0, 1.0, 1.0);
+}
diff --git a/src/demo.c b/src/demo.c
index 3841066..a4bb0c7 100644
--- a/src/demo.c
+++ b/src/demo.c
@@ -34,7 +34,7 @@ int demo_init(void)
 
 	post_init();
 
-	if(!(sdr_gamma = create_program_load("sdr/gamma.v.glsl", "sdr/gamma.p.glsl"))) {
+	if(!(sdr_gamma = create_program_load("sdr/post.v.glsl", "sdr/gamma.p.glsl"))) {
 		fprintf(stderr, "Warning: failed to load the gamma correction shader\n");
 	}
 
@@ -103,11 +103,11 @@ void demo_display(void)
 
 	/* no-srgb gamma correction fallback */
 	if(!opt.srgb) {
-		glBindTexture(GL_TEXTURE_2D, fbtex[0].id);
+		glBindTexture(GL_TEXTURE_2D, post_fbtex[0].id);
 		glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, win_width, win_height);
 
 		glUseProgram(sdr_gamma);
-		overlay_tex(fbtex, 1.0);
+		overlay_tex(post_fbtex, 1.0);
 	}
 }
 
diff --git a/src/part_whitted.c b/src/part_whitted.c
index 658b2ff..eb0fe5b 100644
--- a/src/part_whitted.c
+++ b/src/part_whitted.c
@@ -70,6 +70,8 @@ static void stop(void)
 
 static void draw(long tm)
 {
+	glDisable(GL_DEPTH_TEST);
+
 	glMatrixMode(GL_MODELVIEW);
 	glLoadIdentity();
 	/*
@@ -81,6 +83,9 @@ static void draw(long tm)
 	glRotatef(-cam_phi, 1, 0, 0);
 	glTranslatef(0, 0, cam_dist);
 
+	glBindFramebuffer(GL_FRAMEBUFFER, post_fbo[0]);
+	glClear(GL_COLOR_BUFFER_BIT);
+
 	glUseProgram(sdr);
 	glUniform1f(uloc_aspect, win_aspect);
 
@@ -95,6 +100,10 @@ static void draw(long tm)
 	glVertex2f(-1, 1);
 	glEnd();
 
+	glBindFramebuffer(GL_FRAMEBUFFER, 0);
+	glUseProgram(post_sdr[POST_OLDFIG]);
+	overlay_tex(post_fbtex, 1.0);
+
 	if(dbgtex) {
 		glUseProgram(0);
 		overlay_tex(dbgtex, dbg_alpha);
diff --git a/src/post.c b/src/post.c
index b78284a..91109b2 100644
--- a/src/post.c
+++ b/src/post.c
@@ -1,29 +1,40 @@
-#include <assert.h>
 #include "opengl.h"
 #include "texture.h"
 #include "post.h"
 #include "demo.h"
 #include "opt.h"
+#include "sdr.h"
 
-static unsigned int fbtex_gltexid[2];
-static unsigned int fbo[2], rbuf_depth[2];
-struct texture fbtex[2];
-int fbtex_cur;
+static unsigned int post_fbtex_gltexid[2];
+static unsigned int rbuf_depth[2];
+
+unsigned int post_fbo[2];
+struct texture post_fbtex[2];
+int post_fbtex_cur;
+
+unsigned int post_sdr[MAX_POST_SDR];
 
 int post_init(void)
 {
 	int i;
+	static const char *psdr_fname[] = {"sdr/oldfig.p.glsl"};
+
+	for(i=0; i<MAX_POST_SDR; i++) {
+		if(!(post_sdr[i] = create_program_load("sdr/post.v.glsl", psdr_fname[i]))) {
+			return -1;
+		}
+	}
 
-	glGenTextures(2, fbtex_gltexid);
+	glGenTextures(2, post_fbtex_gltexid);
 	glGenRenderbuffers(2, rbuf_depth);
 
 	for(i=0; i<2; i++) {
-		fbtex[i].id = fbtex_gltexid[i];
-		fbtex[i].width = 0;
-		fbtex[i].height = 0;
-		fbtex[i].pixels = 0;
+		post_fbtex[i].id = post_fbtex_gltexid[i];
+		post_fbtex[i].width = 0;
+		post_fbtex[i].height = 0;
+		post_fbtex[i].pixels = 0;
 
-		glBindTexture(GL_TEXTURE_2D, fbtex[i].id);
+		glBindTexture(GL_TEXTURE_2D, post_fbtex[i].id);
 		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 	}
@@ -32,14 +43,14 @@ int post_init(void)
 
 void post_cleanup(void)
 {
-	if(fbtex_gltexid[0]) {
-		glDeleteTextures(2, fbtex_gltexid);
+	if(post_fbtex_gltexid[0]) {
+		glDeleteTextures(2, post_fbtex_gltexid);
 	}
 	if(rbuf_depth[0]) {
 		glDeleteRenderbuffers(2, rbuf_depth);
 	}
-	if(fbo[0]) {
-		glDeleteFramebuffers(2, fbo);
+	if(post_fbo[0]) {
+		glDeleteFramebuffers(2, post_fbo);
 	}
 }
 
@@ -47,24 +58,24 @@ void post_reshape(int x, int y)
 {
 	int i, ifmt;
 
-	if(x != fbtex[0].width || y != fbtex[0].height) {
+	if(x != post_fbtex[0].width || y != post_fbtex[0].height) {
 		ifmt = opt.srgb ? GL_SRGB_ALPHA : GL_RGBA;
 
 		for(i=0; i<2; i++) {
-			glBindTexture(GL_TEXTURE_2D, fbtex[i].id);
+			glBindTexture(GL_TEXTURE_2D, post_fbtex[i].id);
 			glTexImage2D(GL_TEXTURE_2D, 0, ifmt, x, y, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
-			fbtex[i].width = x;
-			fbtex[i].height = y;
+			post_fbtex[i].width = x;
+			post_fbtex[i].height = y;
 
 			glBindRenderbuffer(GL_RENDERBUFFER, rbuf_depth[i]);
 			glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, x, y);
 		}
 
-		if(!fbo[0]) {
-			glGenFramebuffers(2, fbo);
+		if(!post_fbo[0]) {
+			glGenFramebuffers(2, post_fbo);
 			for(i=0; i<2; i++) {
-				glBindFramebuffer(GL_FRAMEBUFFER, fbo[i]);
-				glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, fbtex_gltexid[i], 0);
+				glBindFramebuffer(GL_FRAMEBUFFER, post_fbo[i]);
+				glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, post_fbtex_gltexid[i], 0);
 				glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, rbuf_depth[i]);
 			}
 			glBindFramebuffer(GL_FRAMEBUFFER, 0);
diff --git a/src/post.h b/src/post.h
index c942630..c9e586e 100644
--- a/src/post.h
+++ b/src/post.h
@@ -3,8 +3,16 @@
 
 #include "texture.h"
 
-extern struct texture fbtex[2];
-extern int fbtex_cur;
+enum {
+	POST_OLDFIG,
+
+	MAX_POST_SDR
+};
+extern unsigned int post_sdr[MAX_POST_SDR];
+
+extern struct texture post_fbtex[2];
+extern int post_fbtex_cur;
+extern unsigned int post_fbo[2];
 
 int post_init(void);
 void post_cleanup(void);